Barrel cap applying and endshake adjusting machine



Oct? 1954 E. VAN HAAFTEN ETAL 2,690,688

BARREL CAP APPLYING AND ENDSHAKE ADJUSTING MACHINE Filed Jan. 8, 1952 2Shets-Sheet 1 IN VENTOR ATTORNEY EGBERT VAN HAAFTEN JOHN REBER,JR.

Oct. 5, 1954 E. VAN HAAFTEN ET AL 2,690,638

BARREL CAP APPLYING AND ENDSHAKE ADJUSTING MACHINE Filed Jan. 8, 19 52 2Sheets-Sheet 2 FIG.4

fill/471A I: FIG. 5

INVENTOR EGBERT VAN HAA FTEN JOHN REBER, JR.

ATTORNEY Patented Oct. 5, 1954 UNETED STATES PATENT GFFICE BARREL CAPAPPLYING AND ENDSHAKE ADJUSTING MACHINE Lancaster, Pa.

Application January 8, 1952, Serial No. 265,378

1 Claim. l

This invention relates to a tool for applying the cap to a watchmainspring barrel and for adjusting the endshake in the barrel arbor.

It is the object of the present invention to provide a tool for applyingthe cap to the mainspring barrel under a uniform pressure throughout thecap area.

A further object of the invention is to provide means for adjustin theendshake of the barrel arbor between the barrel arbor and the bottom ofthe barrel and the cap.

It is a still further object of the invention to provide a tool in whicha barrel having the spring arbor and cap in relative position can beplaced and without changing the position of the barrel, the cap can beapplied and the endshake adjusted before removing the completed barreland spring.

The invention is shown in the accompanying drawings in which:

Figure 1 is a perspective view showing the rear part in cross section.

Figure 2 is a side elevation showing the parts in cross section.

Figure 3 is a perspective view taken from the side opposite to thatshown in Figure 1.

Figure 4 is an enlarged cross sectional view showin the barrel inmounted position.

Figure 5 is a view similar to Figure 4 with the parts in the clampingposition.

Figure 6 is a view of the actual size of one of the larger of thebarrels.

The invention comprises a base 5 which may be mounted on a table, benchor clamped in a vise and supports a framework 6 which is longitudinallybored at l and transversely cut at 8 to provide an opening in line withthe bore for the reception of the barrel. Referring particularly toFigure 2, a movable piston 53 is mounted in the bore '5, said pistonbeing bored and threaded at It to receive a screw threaded rod l l whichis operated by the knurled wheel i2. The bore it in the piston 5 isenlarged at the outer end, as shown at I3, and a plug is is fitted intothe enlarged bore 53 leaving the outer rim 9 extending beyond the plugM. Located centrally of the plu is a spring loaded pin it which isformed with an outward conical depression [6 for the reception of thecap end of the arbor. The other section of the bore 1 has mountedtherein a slidable piston I! formed with a central longitudinal borehaving an enlarged outer portion is in which a spring loaded rod It ismounted. The piston rod extends back through the longitudinal bore to beengaged by a finger 2 on the vertical pivot post 2|. The piston I1 isformed with a rearwardly 2 extending projection 22 which is engaged bythe pivoted cam lever 23 to force the piston I! toward the opening 8.

A locking device for holdin the piston I? in forward position is a rod29 having a hand grip cap 28 and formed with a reduced portion 3!. Therod 29 is normally held in an outward position but when the piston is inthe forward position so that the notch 38 in the piston conforms to thecurve of the rod, the enlarged portion is pushed forward and the pistonheld in the forward position.

The rod It extends through the piston I1 and is engaged at its outer endby the finger 28 carried on the post 2|. The post 2| is mounted forrotation in the frame and is swung through a partial are by the L-shapedlever 24 which is formed with a slot 25 at the end farthest from thepost 2!. The slot 25 receives a screw 25 which is mounted on atransversely sliding rod 2'! extending on either side of the framework.Movement or" the rod 2? slides the rod [9 in and out of the piston 17.

In the operation of the barrel cap applying tool (referring to Figures 4and 5 particularly), a barrel 34 having the spring 35, the arbor 36 andthe cap 3! in position is set up between the conical depression 38 ofthe rod is and the conical depression it of the rod 15. The piston I7 ismoved forward through the cam 23 and the projection 22 so that thebarrel is moved (as shown in Figure 5) to bring the cap into engagementwith the lip 39 of the piston 55 and firmly seated in the groove 46 ofthe barrel. The pressure which is applied to the handle 32 and throughthe cam to the piston l'i determines the amount of endshake in thebarrel arbor. This endshake is critical and must be right. The operatortests this endshake entirely by feel and should the arbor be too looselyfitted, the process is repeated pressing the cap 31 so that it isslightly dished to take up any unnecessary play. Should there be toomuch endshake, the piston l? is moved so that the groove 36 is alignedwith the piston 29 and the larger portion of the piston 29 is movedforward to lock the piston i? in position. Movement of the lever 24rotates the vertical rod 2! and moves the finger 20 to push the rod 19forward and press the barrel arbor outwardly against the cap 3'! whichin turn tends to bow the cap from the metal and increase the playbetween the bearing points of the arbor to produce greater endshake.

With this tool the operator is enabled to apply the cap to the barreland, without removing the barrel from the tool, determine and adjust the3 endshake of the barrel arbor. Previously this has been two separateoperations requiring the mounting in two different fixtures or tools atan expenditure of the time of transfer and the remounting of the barrelarbor in the tool.

What is claimed is:

A barrel cap applying and endshake adjusting tool for use on amainspring barrel, a barrel cap, an arbor and a mainspring, comprising abase formed with a pair of longitudinally aligned spaced cylinders,pistons mounted in said cylinders for restricted longitudinal movement,one of said pistons having a fiat end for engagement with the mainspringbarrel and the other piston being formed with an annular rim forengagement with said cap adjacent the circumference of said cap, wherebypressure exerted by one piston against the end of the mainspring barrelis opposed by pressure exerted against the cap on a circular lineadjacent the circumference of said cap to firmly seat said cap withinsaid barrel, said pistons being formed with central longitudinal bores,rods slidably mounted within said bores, means for moving said pistonstoward each other to seat the barrel cap on the barrel which is mountedbetween said pistons, means for locking one of said pistons, and meansfor moving one of said rods to engage the arbor of the barrel to movesaid arbor against said cap to regulate the relative play between saidarbor and said barrel and cap.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 16 ,913 Granger May 4, 1875 699,547 Merritt May 6, 1902982,635 Rogers et a1 Jan. 24, 1911

